About $5 excluding shipping from rcchamp in Japan, though I couldn't say what it would cost to ship if you only wanted to buy one or two items.
Other than that, I'd probably look at other metric buggies like the HB D4 or Kyosho ZX5 for compatible parts. The Tamiya 510 or 511 should have similar dimension ballcups, though I heard the early cups were problematic; not sure if they've been updated.
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Bring back the CAT!
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